[wizzwizz4]

There's no in-band solution to this problem, but out-of-band solutions might exist! For example: (1) Notify the destination ISP that you're receiving backscatter. (2) That ISP checks where the packets are coming from, and notifies that ISP. (3) Repeat step 2 until source is found. (4) Quarantine that part of the network until it behaves better.

At the end of the day, the internet is people.

[salawat]

People are sometimes shocked to learn that the Internet as a whole works because there is a subset of humanity that really, really likes overseeing the most over-the-top pipe game in existence.

[remram]

Your steps 2&3 require a lot of people to put in work for free to solve someone else's problem.

[wizzwizz4]

But they're not arbitrarily-selected people: they're network administrators. Somebody spoofing IP addresses to the point of abuse reports is practically a personal insult to some of them. (Obligatory: https://xkcd.com/705/)

[remram]

Abuse reports that are not directed at them...

[wizzwizz4]

See also: https://news.ycombinator.com/item?id=41985920